Improvement in seals for dip-pipes in gas-works



G'. DOU TY. SEAL-P0P DIP PIPE 1N GAS WORKS.

ws co, PHoYo-LYHQ. wAsHlNaToN n c taib iair GRAFTON nouer, or. continues, OHIO.

Letters Patent No. 111,440, dated January 31, 1871'.

IMPROVEMENT vIN SEALS `FOR DIP-PIPES IN GAS-WORKS.

The Schedule referred to in these Letters Patent and making part of the same.

I, GRAFTON DOU'IY, of Columbus, in the county of Franklin and Stat-e of Ohio, have invented cert-ain new and useful Improvements in Hydraulic Seals for Apparatus for Manufacturing Illuminating-Gas, of ,which the following is a specitication.

In the manufacture of illuminating-gas it is of great importance to prevent the formation of carbon in the retort, caused by the back pressure produced therein in charging and withdrawing the charge therefrom. p

Itis the object of my invention to providesafe and .cor'ivenient means to'avoidthis objection iu gas-works;

and

It consists in combining with a movable dip-pipe an upper sealing-vessel or reservoir for the purpose of obtaining a sealed joint for the upper end of the dip-pipe, whether the latter be sealed'or unsealed,

i with the retort.

The accompanying drawing represents vertical sections of an hydraulic main, showing one of the movable dip-pipes in the position which it occupies in relation to the hydraulic main and upper seal when sealedand unsealed with said main.

As my invention relates tot-he means of sealing -ber is cast or otherwise formed in two sections, one' within the other.

The inner one, E, is connected to the hydraulic main by a stuffing-box, l?, and the outer one, G, forms apart of the inner one E, aud is closed by a cap-plate, H, packed in any suitable manner.

The inner pipe or chamber E extends into the outer' one, and, being of less diameter, forms an annular chamber, I, which is in constant communication withk the hydraulic main and the retort. rlhis annular chamber is kept ccnstantlyflled with the drip or tar flowing with the gas from the retort, the surplus of which overflows and passes into the main through the inner pipe or chamber E.

'The upper end of the dip-pipe D is provided with an inverted cup, J, which, projecting always below thc surface of the tar or water in said annular chamber lI, forms a perpetual seal to the upper end of the dip-pipe, whether its lower end be'sealed or unsealed with the hydraulic main.

The distinguishing feature, therefore, of my invention consists of a liquid-seal for the upper end of a movable dip-pipe, whether produced by the annular chamber I or by a reservoir of any construction or arrangement in communication with the hydraulic main. l

'Ihe dip-pipe is open at both ends and extends wit-hin the hydraulic main 'and the ripper' sealingchamber, and is suspended, by .a connecting-rod, K, passing through a stuffing-box, L, lin the cap-plate H of the reservoir, and connected to a lever, M, pivoted to a standard on said cap,-aud controlled by a connecting-rod, N, (which may be hooked to the standpipe,) by which the dip-pipe D is raised and lowered to seal and unseal Vthe main, and limited in such movement.

In Figure l of the drawing the main is represented as sealed, and in Figure 2 as unsealed, in both of which positions its upper end. is represented as being sealed by the upper reservoir.

rIhe dip-pipe', while serving as the lneans for opening communication between the retort` and hydraulic main, also serves as the means for cutting off such communication, and in this way furnishes @a simple and safe method of 4controlling the communication of the. r'etort withthe apparatus in .charging and withdrawing thev charge therefrom in` the manufacture ot' gas, and thus relieves the retort of the cause which, in a short time, produces its destruction.

The upper sealing-chamber' may be supplied with water in any convenient manner, or may receive its supply of tar from the retort. lu the latter case it will be selilsupplying, and thus render attention unnecessary.

The hydraulic main is kept supplied with sufficientj water or tar to allow the dip-pipes to be submerged therein, when down, when the doors of the retort are open to withdraw or charge the retort; and the movement of the dip-pipes to unseal the hydraulic main is effected without the least binding or liability to clog or stick by the accumulation of gum or tar thereon, thus rendering their adjustment perfectly easy at all times.

The weight of the dip-pipe effects its descent to seal the main when the connecting-rod N is unhooked.

Having described my invention,

I claim- 1. In hydraulic seals for gas-works, a movable dip pipe, D,l1aving a liquid-seal for both its upper and .lower ends, as described..

2. A movable dip-pipe, D, for sealingand unsealing the hydraulic main A of gas-works, havingl a perpetual liquid seal at its upper end.

3. A liquid-seal for the upper end ofa movable diphydraulic main with a movable pipe, supplied with such sealing-element by the escana gas-ret0rt, as'descrbed. ing tar from the retort, as described. In testimony whereof I have hereunto signed my 4. The inverted cup J of a,l movable dip-pipe, D, name. in combination with the sealing-chamber I and the hydraulic main, with which said chamber communi- Witnesscsz cates, as described. W. H. MILLER,

dip-pipe or pipes and GRAFTON DOUTY 5. The combination of the upper liquid-seal and E. L. DEWITT. 

